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Related Concept Videos

Renal Corpuscle01:20

Renal Corpuscle

The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
Glomerulus: Structure and Function
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Nephrotic Syndrome II : Assessment and Medical Management01:26

Nephrotic Syndrome II : Assessment and Medical Management

IntroductionNephrotic syndrome is a kidney disorder marked by excessive protein loss in the urine, leading to various systemic complications. This condition often results from damage to the glomeruli—the kidney's filtering units—causing proteinuria, low blood protein levels, and fluid retention. Understanding the assessment, diagnosis, and management of nephrotic syndrome is essential for effective treatment and prevention of further kidney damage.AssessmentPatient History: Document any history...
Physiology of Urine Formation01:24

Physiology of Urine Formation

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Acute Kidney Injury II: Pathophysiology01:29

Acute Kidney Injury II: Pathophysiology

Acute kidney injury (AKI) causes are categorized into three primary categories based on the location of the injury: prerenal, intrarenal (or intrinsic), and postrenal causes. This classification guides clinical management and illustrates how different pathways can impair kidney function.Etiology and Pathophysiology of Acute Kidney Injury1. Prerenal causesEtiology: Prerenal Acute Kidney Injury, the most common type, occurs when reduced blood flow to the kidneys decreases filtration capacity...
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The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
Nephrotic Syndrome I : Introduction01:24

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Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of fluid...

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Related Experiment Video

Updated: Jun 17, 2026

Induction of Nephrotic Syndrome in Mice by Retrobulbar Injection of Doxorubicin and Prevention of Volume Retention by Sustained Release Aprotinin
07:38

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Proteinuria and events beyond the slit.

Rikke Nielsen1, Erik Ilsø Christensen

  • 1Department of Anatomy, Section of Cell Biology, Aarhus University, Building 1234, Aarhus C, Denmark.

Pediatric Nephrology (Berlin, Germany)
|January 6, 2010
PubMed
Summary

Proteinuria originates from glomerular or proximal tubule issues. This review explores protein reabsorption, its disruption, and the causes of low molecular weight proteinuria.

Area of Science:

  • Nephrology
  • Cell Biology
  • Molecular Medicine

Background:

  • Proteinuria, the presence of excess proteins in urine, arises from glomerular filtration or proximal tubular reabsorption dysfunction.
  • Normally, low molecular weight proteins are filtered and reabsorbed by the megalin/cubilin/amnionless receptor complex in proximal tubules.
  • Glomerular damage overwhelms proximal tubule reabsorption, leading to proteinuria and potential nephron damage.

Purpose of the Study:

  • To review the origins of proteinuria, focusing on glomerular and proximal tubular mechanisms.
  • To describe the structural basis of protein reabsorption in the proximal tubule.
  • To discuss conditions causing low molecular weight proteinuria.

Main Methods:

  • Literature review of studies on proteinuria and renal protein handling.

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  • Analysis of the structural and functional aspects of proximal tubule protein reabsorption.
  • Examination of specific diseases associated with low molecular weight proteinuria.

    • Main Results:

    • Proteinuria stems from either glomerular damage or proximal tubular reabsorption defects.
    • The megalin/cubilin/amnionless complex is crucial for reabsorbing filtered low molecular weight proteins.
    • Dysfunction of this complex, as seen in Imerslund-Gräsbeck syndrome or Dent's disease, causes low molecular weight proteinuria.

    Conclusions:

    • Understanding proteinuria's origins is key to diagnosing and managing kidney diseases.
    • Proximal tubule protein accumulation can drive inflammation and fibrosis, contributing to renal failure.
    • Defects in proximal tubule endocytic machinery are primary causes of low molecular weight proteinuria.